Question

Design and implement a simple phone book application that stores and manipulates contacts and their phone numbers using Phyton. Requirements specification: The system to be designed and implemented is a phone book that deals with contacts data and their phone numbers, similar in functionality to contacts apps found on smartphones. The system should be able to record and manipulate (add, update, delete, and search) data about contacts and their phone numbers. The data need to be stored in a text file. The following information and constraints should be captured in the application: 1. Each contact is uniquely identified in our phone book by ids. (e.g. 1, 2, 3,…). 2. Each contact has first and last name. (e.g. “John David”). 3. Each contact can have multiple phone numbers (up to three phone numbers). 4. The system should be able to support manipulation of contacts and their phone numbers: • Add (e.g. add/create contact with id 1, first name “John”, last name ”David”, and phone 1234567890). • Update (e.g. change the first name, last name or phone numbers). • Delete (e.g. remove contact with all data associated with that contact including id, first name, last name, and phone numbers). • Search (the system should be able to support querying contacts data based on the first name, last name, and phone numbers).

Answer 1

Here is the python class for the contact and phone book

import sys

class Contact:
def __init__(self, id, firstName, lastName, phone):
self.id = id
self.firstName = firstName
self.lastName = lastName
self.phone = phone
def __str__(self):
return 'Id: {}, Name: {} {}, Phone: {}'.format(self.id, self.firstName, self.lastName, self.phone)

class PhoneBook:
def __init__(self):
self.contacts = []
  
def load_data(self):
fname = "phone.txt"
try:
fileobj = open(fname, 'r')
except IOError:
print("Could not read file:", fname)
return
for line in fileobj:
line = line.strip()
entry = line.split("\t")
if len(entry) == 4: # confirms a valid entry
c = Contact(entry[0],entry[1],entry[2],entry[3])
self.contacts.append(c)

  
def addContact(self, contact):
self.contacts.append(contact)
  
def getContact(self):
return contacts
  
def searchContact(self, id):
for c in self.contacts:
if c.id == id:
return c
  
return None
  
def removeContact(self, id):
c = self.searchContact(id)
if c is None:
return False
self.contacts.remove(c)
return True
  
def updateContact(self, id,firstName, lastName, phone):
c = self.searchContact(id)
if c is None:
return False
c.firstName = firstName
c.lastName = lastName
c.phone = phone
return True
  
def __str__(self):
contacts = [str(c) for c in self.contacts]
contacts.sort()
return 'Phone Book contacts \n{}' .format('\n'.join(contacts))

pb = PhoneBook();
pb.load_data();
print(pb)

def search_contact(word, by,choice):
global pb
fname = "phone.txt"
try:
fileobj = open(fname, 'r')
except IOError:
print("Could not read file:", fname)
sys.exit()
  
search_result = []
sstr =""
for rec in pb.contacts:
print(rec)
if by == 'f':
sstr = rec.firstName
elif by == 'l':
sstr = rec.lastName
elif by == 'p':
sstr = rec.phone
  
if sstr.lower() == word.lower():
search_result.append(rec)

#print(search_result)
if(len(search_result) > 0):
print("ID\tFirst\tLast\tPhone")
print("-"*60)
for s in search_result:
print(str(s.id)+"\t"+ s.firstName+"\t"+ s.lastName+"\t"+ s.phone+"\n")
print("-"*60)
print("Total matching Record Found :",len(search_result))
  
print("Delete Contact(d)\nUpdate Contact(u)\nBack(b)")
action = input("Enter your choice: ")
if action == "d" or action == "u":
action_id = int(input("Enter id of record please: "))
if action == "d":
if pb.removeContact(action_id):
print("Record deleted successfully")
# print contacts stored in phone book
print(pb)
else:
print("Error in deleting contact")
  
if action == "u":
first = input("Enter the First Name: ").strip()
second = input("Enter the Last Name: ").strip()
phone = input("Enter the Phone numbers separated by comma: ").strip()
if pb.updateContact(self, id,firstName, lastName, phone):
print("Record updated successfully")
# print contacts stored in phone book
print(pb)
else:
print("Error in updating contact")
  
else:
print("No record found")

  

print("Welcome to phone book application ")

# Show menu in loop
while (True):
print("Add Contact(a)")
print("Search Contact(s)")
print("Quit(q)")
#store the user choice
choice = input("Enter your option: ").strip().lower()
if choice not in ('a','s','q'):
print("Invalid option. Try again!")
else:
if choice == 'q':
break
elif choice == 's':
print("Which field to search?")
print("First Name (f)\nLast Name (l)\nOr phone (p)\n")
by = input("Enter your choice: ").strip().lower()
#if by not in ('f','l','p'):
word = input("Enter your search word please: ").strip()
search_contact(word,by,choice)
  
elif choice == 'a':
first = input("Enter the First Name: ").strip()
second = input("Enter the Last Name: ").strip()
phone = input("Enter the Phone numbers separated by comma: ").strip()
c = Contact(99,first,second,phone)
pb.addContact(c)
# print contacts stored in phone book
print(pb)
  
else:
print("wrong choice..")
  
print("Thank you!")

Code As image:

Program output:

phone.txt file image

import sys class Contact: def __init__(self, id, firstName, lastName, phone): self.id = id self.firstName = firstName self.lastName = lastName self.phone = phone def str__(self): return 'Name: {} {}, Phone: {}'.format(self.firstName, self.lastName, self.phone) class PhoneBook: def __init__(self): self.contacts = [] def load_data(self): fname = "phone.txt" try: fileobj = open(fname, 'r') except IOError: print("Could not read file:", fname) return for line in fileobj: line = line.strip). entry = line.split("\t") if len(entry) == 4: # confirms a valid entry C = Contact(entry[0], entry[1], entry[2], entry[3]) self.contacts.append(c) def addContact(self, contact): self.contacts.append( contact) def getContact(self): return contacts def searchContact(self, id): for c in self.contacts: if c.id == id: return c return None def removeContact(self, id): c = self.searchContact(id) if c is None: return false self.contacts.remove(c) return True

def updateContact(self, id, firstName, lastName, phone): C = self.search Contact(id) if cis None: return false c.firstName = firstName c.lastName = lastName c. phone = phone return True def_str_(self): contacts = [str(c) for c in self.contacts] contacts.sort() return 'Phone Book contacts {}' .format('\n'.join(contacts)) pb = PhoneBook(); pb. load_data(); print(pb) def search_contact(word, by, choice): global pb fname = "phone.txt" try: fileobj = open(fname, 'r') except IOError: print("Could not read file:", fname) sys.exit() search_result = [] # set the index column of the data file #open file in read mode #fileobj = open("data.txt", "r") # read file line by line #for line in fileobj: sstr =". for rec in pb.contacts: print (rec) if by == 'f': sstr = rec. firstName elif by == 'l': sstr = rec.lastName elif by == 'p': sstr = rec. phone if sstr. lower() == word. lower(): search_result.append(rec)

#print (search_result) if(len( search result) > 0): print("ID\tFirst\tLast\tPhone") print("-"*60) for sin search_result: print(s.id+" "+ S. firstName+" "+ s.lastName+"\t"+ s.phone+"\n") print("-"*60) print("Total matching Record Found :", len(search_result)) print("Delete Contact(d) \nUpdate Contact(u)n\Back(b)") action = input("Enter your choice: ") if action == "d" or action == "u": action_id = int(input("Enter id of record please: ")) if action == "d": if pb.removeContact(action_id): print("Record deleted successfully") else: print("Error in deleting contact") if action == "d": first = input("Enter the First Name: ").strip(). second = input("Enter the Last Name: ").strip(). phone = input ("Enter the phone numbers separated by comma: ").strip() if pb.updateContact(self, id, firstName, lastName, phone): print("Record updated successfully") else: print("Error in updating contact") else: print("No record found")

print("Welcome to phone book application") # Show menu in loop while (True): print("Add Contact(a)") print("Search Contact(s)") print("Quit(q)") #store the user choice choice = input("Enter your option: ").strip().lower(). if choice not in ('a', 's', 'q'): print("Invalid option. Try again!") else: if choice == 'g': break elif choice == 's': print("Which field to search?") print("First Name (f) \nLast Name (1) \nor phone (p) \n") by = input("Enter your choice: ").strip().lower(). #if by not in ('f', 'l', 'p'): word = input("Enter your search word please: ").strip() search_contact(word, by, choice) elif choice == 'a': first = input("Enter the First Name: ").strip(). second = input("Enter the Last Name:").strip) phone = input("Enter the phone numbers separated by comma: ").strip() c = Contact(99, first, secod, phone) pb.addContact(c) else: print("wrong choice..") print("Thank you!")

input Phone Book contacts Name: Garry Potter, Phone: 1234566,1234576,1234533 Name: Harry Potter, Phone: 1234567,1234577,1234534 Welcome to phone book application Add Contact(a) Search Contact(s) Quit(a) Enter your option: S Which field to search? First Name (f) Last Name (1) Or phone (p) Enter your choice: 1 Enter your search word please: potter Name: Harry Potter, Phone: 1234567,1234577,1234534 Name: Garry Potter, Phone: 1234566,1234576,1234533 ID First Last Phone 1 Harry Potter 1234567,1234577,1234534 Garry Potter 1234566,1234576,1234533 Total matching Record Found : 2 Delete Contact(d)

main.py phone.txt 1 1 Harry Potter 2 2 Garry Potter : 1234567,1234577,1234534 1234566,1234576,1234533